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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2004 Posts: 201 'Bolter | | 'Bolter Joined: Sep 2004 Posts: 201 | Where can I find roller rockers and a mild cam for my 235 if there is such a thing? | | | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | You won't find any roller rockers or roller lifters. You will find a few places with hopped up cams. Egge, Patrick's, Clifford, and Comp Cams can all do you good in the Camshaft department. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
One mild cam for a 235 would be a 261 cam.
| | | | | Joined: Mar 2006 Posts: 76 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2006 Posts: 76 | I got a cam from Patricks for my 261 that was "OK" but the lifters were apparently soft and were worn out at very low mileage. I replaced it with a cam from Delta Cam in Tacoma, WA and have been VERY happy with it. The engine has twin Holley-weber carbs, Fenton headers and electronic ignition. The cam they sent me was just right for my application but they can provide pretty much anything you need. My 2 cents worth. | | | | | Joined: Aug 2004 Posts: 1,067 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 1,067 | Yes, lifter materials have not been as good as they used to be, but more than ever, the Zinc lubricating additive, known as ZDDP, has been omitted from most engine oils because modern roller engines don't require it anymore. It is very important to either purchase this additive, especially during cam break in, or use an oil that does have ZDDP in it. Shell Rotella 15W40 diesel oil used to be good for that, but I don't know if they still have zinc, that may have changed too. | | | | | Joined: Sep 2007 Posts: 2,644 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 2,644 | Having to add Zinc to motor oil for flat lifter cams is a myth. This subject has been beat to death repeatedly yet it still surfaces.
It might be a good idea to throw some in during break in but all major motor oil manufacturers have reassured people that modern oils are perfectly capable of handling non-roller lifters.
Lifter/cam failures are almost always the result of cheap parts made from inferior materials. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Having to add Zinc to motor oil for flat lifter cams is a myth. This subject has been beat to death repeatedly yet it still surfaces.
It might be a good idea to throw some in during break in but all major motor oil manufacturers have reassured people that modern oils are perfectly capable of handling non-roller lifters.
Lifter/cam failures are almost always the result of cheap parts made from inferior materials. I agree 100%. Also need to throw in improper assembly, especially from the so-called "profesional" engine builders that are quick to blame the oil instead of warranteing their shoddy workmanship. Also, incorrect parts matching, like using a far too stiff valve spring with a street hydraualic cam. I've actually had the chance to see how the oil wear tests are done through my work (we're and authorised Valvoline Oil Change Center), Valvoline actually uses a flat tappet cam engine (Buick 231) for the cam wear test. Nevermind all of the flat tappet vehicles we put SM grade oil in every day. Have yet to have one come back with an engine failure claim.
Bill Burmeister
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